There is still a problem in sympy because zeta(x,y) is not implemented in Matlab whereas the current implementation generated "zeta(x, y)". ~~~I will rename this bug...~~~ Update: this bug title is vague enough that its still accurate ;-)

A previous commit mapped `zeta(x, n)` to `"zeta(n, x)"`: this is incorrect
because in Matlab's Symbolic Toolbox, this means the nth derivative of the
Riemann zeta function. But for us, its the Hurwitz zeta function.
Instead, just mark the two-arg zeta as unimplemented.
Closessympy/sympy#14820
// edited by skirpichev